A curious thought on DW passive sonar detection range

[Castout]

Yesterday when I played SC campaign in DW I noticed something that intrigue me.
My platform was the Akula II Vepr and I played with LWAMI 3.08 mod installed.

With regard to passive sonar detection range I found that I was just able to detect an Arleigh Burke DDG travelling at 9-11 knots at about 3-3.5 nmi range which is roughly less than 7km away. And it only showed in the narrowband.

Now this is what intrigue me as when I played Silent Hunter III I found that I was able to detect slow moving merchant(5 knots speed) at about 10 km or more.

I know that with LWAMI installed I should have my passive sonar detection range enhanced and that DW is set in modern times when even the military surface ships are designed with noise dampening in mind hence they are more silent than merchant ships but my detection range for merchant ships is also not that great having able to detect them only at mostly 8 nmi(that is les than 12km) to have them on the broadband contact which enables the DEMON calculation.

I have also heard that DW only model direct sound contact but
Are these detection ranges not ridiculously too short for modern top of the line submarine?:hmm: